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Cynnamic acid

Recently, Piancatelli has employed PhSeCl in the presence of zinc chloride to effect the stereospecific chloroselenenylation of electron-poor olefins such as ethyl maleate and fumarate, methyl acrylate and methyl vinyl ketone [52]. The addition occured with good regioselectivity also in the cases of the methyl esters of acrylic, crotonic and cynnamic acids 62 (Scheme 10). In the latter cases, if the... [Pg.21]

Besides of ethene also other alkenes react with carbon dioxide in the presence of nickel(0) complexes. Some examples are given in Figure 6. Hexenes lead to different isomeric heptanoic acids, styrene reacts to cynnamic acid and norbornene (bicyclo 2.2.1 heptene) gives the exo-norbornane-2-carboxylic acid in 95 % yield [5,12,13]. Nor-bornadiene which contains two isolated double bonds reacts to a monoaddition product whose decomposition with hydrochloric acid yields a mixture of six chloronorbornanecarboxylic acids with the chloro-and carboxy-substituents both in exo- and in endo-positions [14]. [Pg.63]

Vinylesters are unsaturated, hence thermosetting, resins, prepared by the reaction of a monofunctional unsaturated acid, e.g. methacrylic, acrylic, crotonic or cynnamic acid, with a bisphenol diepoxide. This type of structure is referred to as bisphenol-A epoxy vinyl ester (Fig. 4.3(a)). The structural difference, which at least partially justihes the improved chemical and mechanical properties of vinylester, is the presence in vinylesters of reactive double bonds at the ends of the chains only, while unsaturated polyester resins have the reactive double bonds distributed throughout the chains. [Pg.79]


See other pages where Cynnamic acid is mentioned: [Pg.1086]    [Pg.150]    [Pg.150]    [Pg.1086]    [Pg.150]    [Pg.150]    [Pg.872]   
See also in sourсe #XX -- [ Pg.63 ]




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